*{
    margin: 0;
    padding: 0;
}
body{
    background-color: #e9eef3;
}
a{
    text-decoration: none;
}
li{
    list-style: none;
}
.fl{
    float: left;
}
.fr{
    float: right;
}
.clearfix::after{
    content: '';
    clear: both;
    display: block;
}
.mt{
    margin-top: 15px;
}
.ml{
    margin-left: 15px;
}
.mr{
    margin-right: 15px;
}
.mb{
    margin-bottom: 15px;
}
.cell{
    text-align: center;
}